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Study and Visualization of the Fuel Distribution in a Stratified Spark Ignition Engine with EGR Using Laser-Induced Fluorescence
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Abstract
In this study, we report experimental investigations on the air/fuel distribution in the combustion chamber of a spark ignition engine during the first stage of combustion, and prior to ignition. Several modifications were made to a single cylinder to give optical access to the combustion chamber via a glass cylinder. These modifications included the addition of electro-magnetic valves, with a strategic placement for internal exhaust gas recirculation (EGR), and a quartz glass cylinder for optical access. With the placement and timing of the electro-magnetic valves and exhaust gas recirculation rates up to 40 % mass, the engine's combustion process was greatly improved. These improvements included a reduction of fuel consumption by 8 % and a reduction in NOx emissions of 90 %.
The flow of air/fuel mixture into the combustion chamber was visualized by Planar Laser-Induced Fluorescence (PLIF) and captured as 8-bit gray scale images. Highly resolved temporal and spatial images of the fuel distribution were obtained for different engine operating conditions. Specifically, the load and engine speed were varied. These images were then employed to develop a model for the fuel distribution obtained in the combustion chamber. This model was used to explain how the improvements to the combustion process were obtained. The effects of varying the engine load and speed on the stratification of fuel in the chamber were compared. The results of this comparison showed that similar engine performance improvements were obtainable for different loads and engine speeds.
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Meyer, J., Graul, W., Kiefer, K., Thiemann, J. et al., "Study and Visualization of the Fuel Distribution in a Stratified Spark Ignition Engine with EGR Using Laser-Induced Fluorescence," SAE Technical Paper 970868, 1997, https://doi.org/10.4271/970868.Also In
References
- ECKBRETH, A. C. „Laser Diagnostics for Combustion Temperature and Species” Energy and Engineering Science Series 7 Cambridge Abacus Press. 1988
- FANSLER, T. D. FRENCH, D. T. DRAKE, M. C. „Fuel Distribution in a Firing Direct-Injection Spark-Ignition Engine Using Laser Induced Fluorescence Imaging” SAE Paper No. 950110 1995
- GUIBAULT, G.G „Practical Fluorescence Theory, Methods and Techniques” Marcel Dekker Inc. New York, USA. 1973
- HANSON, R.K. „Combustion Diagnostics: Planar Imaging Techniques” Twenty-first Symp. on Comb. The Combustion Institute 1677 1691 1986
- HARDALUPAS, R.K. „Combustion Diagnostics: Planar Imaging Techniques” Twenty-first Symp. on Comb. The Combustion Institute 1677 1691 1986
- HAUG M. SCHULPIN H.J. „Determination of the Fluorescence and Oxygen Quenching Rate of Vapour Phase Fluoranthene” Appl. Spectroscopy 48. 1994
- HEINZE A.T. BARITAUD A.T. „Development of a Laser-Induced Fluorescence (LIF) Method to Visualize the Gasoline Distribution in an SI Engine” 6th Int. Symp. on Appl. of Laser Techniques to Fluid Mechanics Lisbon 1992
- HEYWOOD, J.B. „Internal Combustion Engine Fundamentals” McGraw Hill U.S.A. 1988
- JOHANSON, B. NEIJ, H. ALDÉN, M. JUHLIN, G. „Investigation of the Influence of Mixture Preparation on Cyclic Variations in a SI-Engine, Using Laser Induced Fluorescence” SAE Paper No. 950108 1995
- KIM J. U. GOLDING B. SCHOCK H. J. KELLER P. NOCERA D. G. „Exiplex Fluorescence Visualization Systems for Pre-Combustion Diagnosis of an Automotive Gasoline Engine” SAE Paper No. 960826 1996
- MEYER J. HAUG M. SCHREIBER M. UNVERZAGT S. “Controlling Combustion in a Spark Ignition Engine by Quantitive Fuel Distribution” SAE Paper No. 950107 1995
- MEYER J. SCHREIBER M. HAUG M. SIEMERS A. SCHULPIN H.J. „Quantitative Fuel Distribution in a Spark Ignition Engine, Measurement and Observation Analysis of Combustion in Engines” IMechE-Seminar 1994
- MEYER J. “Laserdiagnostische Untersuchung zur innermotorischen Gemischaufbereitung bei Abgasrückführung” RWTH Aachen Germany 1996
- MEYER J. KIEFER K. VON ISSENDORFF F. THIEMANN J. HAUG M. SCHREIBER M. “Spray Visualization of Air-Assisted Fuel Injection Nozzles for Direct Injection SI-Engines” SAE, No. 97P-102 1997
- PISCHINGER F.
- SCHÄFER F. VAN BASSHUYSEN R. 7 Springer-Verlag 1993
- STIEBELS B. SCHREIBER M. SADAT SAKAK, A. “Development of a new measurement Technique for the Investigation of End Gas Autoignition and Engine Knock” SAE Paper No. 960827 1996
- SWINDAL, J. C. DRAGONETTI, D. P. HAHN, R. T. FURMAN, P. A. ACKER, W. P. „In-Cylinder Charge Homogeneity During Cold-Start Studied with Fluorescent Tracers Simulating Different Fuel Distillation Temperatures” SAE Paper No. 950106 1995
- TABATA M. KATAOKA, M. FUJIMOTO, M. NOH, Y. „In-Cylinder Fuel Distribution, Flow Field, and Combustion Characteristics of a Mixture Injected SI Engine” SAE Paper No. 950104 1995